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djverab [1.8K]
3 years ago
14

How can you tell when the magnesium metal has reacted completely?

Chemistry
1 answer:
aleksklad [387]3 years ago
6 0
Magnesium metal with the application of heat reacts with oxygen in air to form magnesium oxide. The balanced chemical reaction is: 2Mg + O2 -> 2MgO. You can tell that the magnesium metal has reacted completely when you can no longer see small sparks. This means that it has been completely consumed and no reaction occurs anymore. 
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Answer:

The answer is

<h2>20 %</h2>

Explanation:

The percentage error of a certain measurement can be found by using the formula

P(\%) =  \frac{error}{actual \:  \: number}  \times 100\% \\

From the question

actual volume = 35 mg

error = 35 - 28 = 7

The percentage error is

P(\%) =  \frac{7}{35}  \times 100 \\  =  \frac{1}{5}  \times 100 \\  =  20

We have the final answer as

<h3>20 %</h3>

Hope this helps you

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Answer:

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Explanation:

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